not graphically but if you aren't using senate functionality you can get rid of senate tab and senate offices button by internally re-naming the romans_senate - see end of this thread:
https://forums.totalwar.org/vb/showt...t=63904&page=2
I put up files for doing that to vanilla - you'd need to do your own if you already modded game.
that also makes the SPQR slot available for use as a standard faction without hard-coded problems
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